I believe I know what you are trying to say, but sinlessness does not mean that a person does not benefit from learning. I would posit that Jesus would learn to express the good that He possessed in His nature.
Remember, Jesus continually grew in wisdom and in stature and in favor with God and humankind.
It is difficult for our minds - so influenced by 2000 years of Christian teaching about the sinfulness of humankind - to differentiate between what is "human" and what is "sin." If we don't think carefully about it, we can come up with some strange ideas that assume that all bodily functions are inherently sinful and so a person who hopes to please God cannot experience physical pleasure without sinning. Therefore, no good food, no sexual relations in marriage (except for the unfortunately necessary obligation to procreate), no enjoyment of the good things in life.
It is human to have to learn how to control one's body (the primary goal of early childhood) and develop one's mind (a God-mandated calling, BTW), as well as grow in our relationship to God. It is not sin if Jesus hit His thumb with a hammer while learning the trade in Joseph's shop. It is not a sin that Jesus more likely had to learn to walk. It is not sin that Jesus had to learn the Torah, the prophets and the writings as he grew up instead of just having all of that when He was born. It was not sin that He asked the greatest Jewish minds sincere questions when He was at the temple at 12 years old. (They were amazed at the profundity of His questions, His blazing intellect, and His ability to lay bare the weaknesses of their presuppositions. The great minds of Jewish life and Jesus could not get enough of each other, so much so that they were only interrupted when His parents came to get Him a few days later.) It is not sin that Jesus could not carry the heavy cross beam all the way to the site of His crucifixion because He was so weak from His torture and sufferings.
The Incarnation is a very difficult and challenging thing to meditate on, because it has enormous implications for the way we are to live our lives in Christ.
